Oblique
From Apics
Oblique is used here as any non-core participant marked by an adposition or a case, e.g. to me, for me, the Dative or Locative case.
Obliques contrast with core participants, i.e. participants that are agents or patients of canonical transitive clauses, or are coded like them (thus, in English Mary gave John a book, there are three core arguments). For the sake of simplicity, we sometimes refer to the agent as "subject" and to the patient as "object".